Add cache directives

app/views/cards/comments/reactions/_reaction.json.jbuilder

@@ -1,5 +1,7 @@
-json.(reaction, :id, :content)
-json.reacter do
-  json.partial! "users/user", user: reaction.reacter
+json.cache! reaction do
+  json.(reaction, :id, :content)
+  json.reacter do
+    json.partial! "users/user", user: reaction.reacter
+  end
+  json.url card_comment_reaction_url(reaction.comment.card, reaction.comment, reaction)
 end
-json.url card_comment_reaction_url(reaction.comment.card, reaction.comment, reaction)

app/views/cards/steps/_step.json.jbuilder

@@ -1 +1,3 @@
-json.(step, :id, :content, :completed)
+json.cache! step do
+  json.(step, :id, :content, :completed)
+end

app/views/columns/_column.json.jbuilder

@@ -1,2 +1,4 @@
-json.(column, :id, :name, :color)
-json.created_at column.created_at.utc
+json.cache! column do
+  json.(column, :id, :name, :color)
+  json.created_at column.created_at.utc
+end